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Ribbons and Chains
Jan. 25, 2012

Ribbons and Chains
Jan. 25, 2012
Title : Ribbons and Chains
Description : This view shows several groups of similar-sized craters arranged roughly in lines. Crater chains are sometimes formed by volcanic eruptions, but the craters here were made by secondary impacts. The excavation of a large crater or basin can throw out blocks of material along radial trajectories. The blocks then sometimes strike the surface nearly in the same location, producing secondary crater chains. Finer ejecta may form the bright ribbons known as crater rays.

This image was acquired as part of MDIS's high-resolution surface morphology base map. The surface morphology base map covers more than 90% of Mercury's surface with an average resolution of 250 meters/pixel (0.16 miles/pixel or 820 feet/pixel). Images acquired for the surface morphology base map typically have off-vertical Sun angles (i.e., high incidence angles) and visible shadows so as to reveal clearly the topographic form of geologic features.
Date : Jan. 25, 2012
Credit : NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Source : Johns Hopkins University Applied Physics Laboratory
File Type : JPG
File Size : 409kb


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